const byte rowPins[5] = {9, 10, 11, 12, 13};
const byte columnPins[4] = {2, 3, 4, 5};
const byte rows = 5, columns = 4;
const unsigned long digits[10] = {
  0b11111001100110011111, // 0
  0b01000110010001000100, // 1
  0b01101001010000101111, // 2
  0b01101001010010010110, // 3
  0b10011001111110001000, // 4
  0b11110001111110001111, // 5
  0b11111000111110011111, // 6
  0b11111000010000100001, // 7
  0b11111001111110011111, // 8
  0b11111001111110001111  // 9
};
int bitPosition, resistance = 1, previousResistance = 0;
bool bitValue;
byte whichDigit;

const byte digitZero[5][4] = {
  {1, 1, 1, 1},
  {1, 0, 0, 1},
  {1, 0, 0, 1},
  {1, 0, 0, 1},
  {1, 1, 1, 1}
};

void setup() {
  Serial.begin(9600);
  for (int i = 0; i < rows; i++) {
    pinMode(rowPins[i], OUTPUT);
    digitalWrite(rowPins[i], LOW);
  }
  for (int i = 0; i < columns; i++) {
    pinMode(columnPins[i], OUTPUT);
    digitalWrite(columnPins[i], HIGH);
  }
  pinMode(8, INPUT);
}

void loop() {
  resistance = map(analogRead(8), 0, 1023, 0, 9);
  Serial.println(resistance);
  for (int j = 0; j < rows; j++) {
    digitalWrite(rowPins[j], HIGH);
    for (int i = 0; i < columns; i++) {
      bitPosition = j * columns + i;
      bitValue = (digits[resistance] >> bitPosition) & 1;
      digitalWrite(columnPins[i], bitValue ? LOW : HIGH);
    }
    for (int i = 0; i < columns; i++) {
      digitalWrite(columnPins[i], HIGH);
    }
    digitalWrite(rowPins[j], LOW);
    
  }
}

/*for (int i = 15; i >= 0; --i) {
        // Extract the i-th bit
        bool bit = (digitOne >> i) & 1;

        // Compare the bit with something else (e.g., check if it's 1)
        if (bit == 1) {
            Serial.println("Bit "+String(i)+" is 1");
        } else {
            Serial.println("Bit "+String(i)+" is 0");
        }
   }*/